Suggest (not 100% know) that Flight radar holds the answer...
FR2315 BTSSTN EI-DWP departed 3 hours late
Prior to this DWPs last flight was on the 6th
FR2314 STNBTS EI-EVT departed on time and arrived early
FR8303/4 BTS-VDA-BTS then operated by EI-EVT 4 hours late
Suggestion....EI-DWP was meant to operate BTS-VDA-BTS on the 08/12, lots of fuel required for this, and potential tankering as well. So aircraft pre-fueled, or fueled, then for whatever reason (tech/operational/other) aircraft is no longer going to Ovda but going to STN instead. Too much fuel on board (above MLW), agreement between ops/pilots that the best option is FL220 + holding. It's not an elegant solution, but likely to be the solution that causes the least delays, and least costly.
Once again all a guess!